-1/2 a^{a1}_{c0} b^{c1,c2}_{c4,v0} c^{c4,a0}_{c3,a2} eta1^{a2}_{a1} a+(c0) a+(c3) a+(v0) a-(a0) a-(c2) a-(c1)
-a^{a0}_{c2} b^{c0,c2}_{c3,v0} c^{c3,a2}_{c1,a1} a+(c1) a+(a1) a+(v0) a-(a2) a-(a0) a-(c0)
+a^{a1}_{c2} b^{c0,c2}_{c3,v0} c^{c3,a0}_{c1,a2} eta1^{a2}_{a1} a+(c1) a+(v0) a-(a0) a-(c0)
+1/2 a^{a1}_{c4} b^{c1,c2}_{c0,v0} c^{c4,a0}_{c3,a2} eta1^{a2}_{a1} a+(c0) a+(c3) a+(v0) a-(a0) a-(c2) a-(c1)
-a^{a1}_{c4} b^{c1,c4}_{c0,v0} c^{c3,a0}_{c2,a2} eta1^{a2}_{a1} a+(c0) a+(c2) a+(v0) a-(a0) a-(c3) a-(c1)